Formula: Na2(Si,Al,Be)7(O,OH,F)14
Origin of name: For Leif Ericson, Norwegian mariner
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: Colourless, white
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals acicular, deeply striated, rosettes and radial aggregates
Hardness: 6
Specific gravity: 2.57
Cleavage: 1; {10-10} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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